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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2014 Google, Inc.
4 */
5
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8#include <linux/delay.h>
9#include <linux/init.h>
10#include <linux/hrtimer.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/time.h>
14#include <linux/numa.h>
15#include <linux/nodemask.h>
16#include <linux/topology.h>
17
18#define TEST_PROBE_DELAY (5 * 1000) /* 5 sec */
19#define TEST_PROBE_THRESHOLD (TEST_PROBE_DELAY / 2)
20
21static atomic_t warnings, errors, timeout, async_completed;
22
23static int test_probe(struct platform_device *pdev)
24{
25 struct device *dev = &pdev->dev;
26
27 /*
28 * Determine if we have hit the "timeout" limit for the test if we
29 * have then report it as an error, otherwise we wil sleep for the
30 * required amount of time and then report completion.
31 */
32 if (atomic_read(&timeout)) {
33 dev_err(dev, "async probe took too long\n");
34 atomic_inc(&errors);
35 } else {
36 dev_dbg(&pdev->dev, "sleeping for %d msecs in probe\n",
37 TEST_PROBE_DELAY);
38 msleep(TEST_PROBE_DELAY);
39 dev_dbg(&pdev->dev, "done sleeping\n");
40 }
41
42 /*
43 * Report NUMA mismatch if device node is set and we are not
44 * performing an async init on that node.
45 */
46 if (dev->driver->probe_type == PROBE_PREFER_ASYNCHRONOUS) {
47 if (IS_ENABLED(CONFIG_NUMA) &&
48 dev_to_node(dev) != numa_node_id()) {
49 dev_warn(dev, "NUMA node mismatch %d != %d\n",
50 dev_to_node(dev), numa_node_id());
51 atomic_inc(&warnings);
52 }
53
54 atomic_inc(&async_completed);
55 }
56
57 return 0;
58}
59
60static struct platform_driver async_driver = {
61 .driver = {
62 .name = "test_async_driver",
63 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
64 },
65 .probe = test_probe,
66};
67
68static struct platform_driver sync_driver = {
69 .driver = {
70 .name = "test_sync_driver",
71 .probe_type = PROBE_FORCE_SYNCHRONOUS,
72 },
73 .probe = test_probe,
74};
75
76static struct platform_device *async_dev[NR_CPUS * 2];
77static struct platform_device *sync_dev[2];
78
79static struct platform_device *
80test_platform_device_register_node(char *name, int id, int nid)
81{
82 struct platform_device *pdev;
83 int ret;
84
85 pdev = platform_device_alloc(name, id);
86 if (!pdev)
87 return ERR_PTR(-ENOMEM);
88
89 if (nid != NUMA_NO_NODE)
90 set_dev_node(&pdev->dev, nid);
91
92 ret = platform_device_add(pdev);
93 if (ret) {
94 platform_device_put(pdev);
95 return ERR_PTR(ret);
96 }
97
98 return pdev;
99
100}
101
102static int __init test_async_probe_init(void)
103{
104 struct platform_device **pdev = NULL;
105 int async_id = 0, sync_id = 0;
106 unsigned long long duration;
107 ktime_t calltime;
108 int err, nid, cpu;
109
110 pr_info("registering first set of asynchronous devices...\n");
111
112 for_each_online_cpu(cpu) {
113 nid = cpu_to_node(cpu);
114 pdev = &async_dev[async_id];
115 *pdev = test_platform_device_register_node("test_async_driver",
116 async_id,
117 nid);
118 if (IS_ERR(*pdev)) {
119 err = PTR_ERR(*pdev);
120 *pdev = NULL;
121 pr_err("failed to create async_dev: %d\n", err);
122 goto err_unregister_async_devs;
123 }
124
125 async_id++;
126 }
127
128 pr_info("registering asynchronous driver...\n");
129 calltime = ktime_get();
130 err = platform_driver_register(&async_driver);
131 if (err) {
132 pr_err("Failed to register async_driver: %d\n", err);
133 goto err_unregister_async_devs;
134 }
135
136 duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
137 pr_info("registration took %lld msecs\n", duration);
138 if (duration > TEST_PROBE_THRESHOLD) {
139 pr_err("test failed: probe took too long\n");
140 err = -ETIMEDOUT;
141 goto err_unregister_async_driver;
142 }
143
144 pr_info("registering second set of asynchronous devices...\n");
145 calltime = ktime_get();
146 for_each_online_cpu(cpu) {
147 nid = cpu_to_node(cpu);
148 pdev = &async_dev[async_id];
149
150 *pdev = test_platform_device_register_node("test_async_driver",
151 async_id,
152 nid);
153 if (IS_ERR(*pdev)) {
154 err = PTR_ERR(*pdev);
155 *pdev = NULL;
156 pr_err("failed to create async_dev: %d\n", err);
157 goto err_unregister_async_driver;
158 }
159
160 async_id++;
161 }
162
163 duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
164 dev_info(&(*pdev)->dev,
165 "registration took %lld msecs\n", duration);
166 if (duration > TEST_PROBE_THRESHOLD) {
167 dev_err(&(*pdev)->dev,
168 "test failed: probe took too long\n");
169 err = -ETIMEDOUT;
170 goto err_unregister_async_driver;
171 }
172
173
174 pr_info("registering first synchronous device...\n");
175 nid = cpu_to_node(cpu);
176 pdev = &sync_dev[sync_id];
177
178 *pdev = test_platform_device_register_node("test_sync_driver",
179 sync_id,
180 NUMA_NO_NODE);
181 if (IS_ERR(*pdev)) {
182 err = PTR_ERR(*pdev);
183 *pdev = NULL;
184 pr_err("failed to create sync_dev: %d\n", err);
185 goto err_unregister_async_driver;
186 }
187
188 sync_id++;
189
190 pr_info("registering synchronous driver...\n");
191 calltime = ktime_get();
192 err = platform_driver_register(&sync_driver);
193 if (err) {
194 pr_err("Failed to register async_driver: %d\n", err);
195 goto err_unregister_sync_devs;
196 }
197
198 duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
199 pr_info("registration took %lld msecs\n", duration);
200 if (duration < TEST_PROBE_THRESHOLD) {
201 dev_err(&(*pdev)->dev,
202 "test failed: probe was too quick\n");
203 err = -ETIMEDOUT;
204 goto err_unregister_sync_driver;
205 }
206
207 pr_info("registering second synchronous device...\n");
208 pdev = &sync_dev[sync_id];
209 calltime = ktime_get();
210
211 *pdev = test_platform_device_register_node("test_sync_driver",
212 sync_id,
213 NUMA_NO_NODE);
214 if (IS_ERR(*pdev)) {
215 err = PTR_ERR(*pdev);
216 *pdev = NULL;
217 pr_err("failed to create sync_dev: %d\n", err);
218 goto err_unregister_sync_driver;
219 }
220
221 sync_id++;
222
223 duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
224 dev_info(&(*pdev)->dev,
225 "registration took %lld msecs\n", duration);
226 if (duration < TEST_PROBE_THRESHOLD) {
227 dev_err(&(*pdev)->dev,
228 "test failed: probe was too quick\n");
229 err = -ETIMEDOUT;
230 goto err_unregister_sync_driver;
231 }
232
233 /*
234 * The async events should have completed while we were taking care
235 * of the synchronous events. We will now terminate any outstanding
236 * asynchronous probe calls remaining by forcing timeout and remove
237 * the driver before we return which should force the flush of the
238 * pending asynchronous probe calls.
239 *
240 * Otherwise if they completed without errors or warnings then
241 * report successful completion.
242 */
243 if (atomic_read(&async_completed) != async_id) {
244 pr_err("async events still pending, forcing timeout\n");
245 atomic_inc(&timeout);
246 err = -ETIMEDOUT;
247 } else if (!atomic_read(&errors) && !atomic_read(&warnings)) {
248 pr_info("completed successfully\n");
249 return 0;
250 }
251
252err_unregister_sync_driver:
253 platform_driver_unregister(&sync_driver);
254err_unregister_sync_devs:
255 while (sync_id--)
256 platform_device_unregister(sync_dev[sync_id]);
257err_unregister_async_driver:
258 platform_driver_unregister(&async_driver);
259err_unregister_async_devs:
260 while (async_id--)
261 platform_device_unregister(async_dev[async_id]);
262
263 /*
264 * If err is already set then count that as an additional error for
265 * the test. Otherwise we will report an invalid argument error and
266 * not count that as we should have reached here as a result of
267 * errors or warnings being reported by the probe routine.
268 */
269 if (err)
270 atomic_inc(&errors);
271 else
272 err = -EINVAL;
273
274 pr_err("Test failed with %d errors and %d warnings\n",
275 atomic_read(&errors), atomic_read(&warnings));
276
277 return err;
278}
279module_init(test_async_probe_init);
280
281static void __exit test_async_probe_exit(void)
282{
283 int id = 2;
284
285 platform_driver_unregister(&async_driver);
286 platform_driver_unregister(&sync_driver);
287
288 while (id--)
289 platform_device_unregister(sync_dev[id]);
290
291 id = NR_CPUS * 2;
292 while (id--)
293 platform_device_unregister(async_dev[id]);
294}
295module_exit(test_async_probe_exit);
296
297MODULE_DESCRIPTION("Test module for asynchronous driver probing");
298MODULE_AUTHOR("Dmitry Torokhov <[email protected]>");
299MODULE_LICENSE("GPL");